Citrus leafminer (Phyllocnistis citrella) is the larva of a small moth originating from south-east Asia and is commonly seen in backyard citrus trees. The larva infests young foliage in Summer through to Autumn, peaking in February or March and feeds within the leaves creating distinctive silvery tunnels or 'mines'.
The larvae are the damaging stage, attacking the young growth flush and causing leaves to twist and curl. This damage is easily identified by the mines that the larvae produce in the leaves. Older trees can usually sustain damage, but young trees can be severely affected.